Statistical reports from American institutions show that comparatively few cases of Huntington's chorea are committed. In 49,640 first admissions to the New York state hospitals only forty-eight, or .09 per cent, were diagnosed as Huntington's chorea during a period of eight years. The admission rate to the Massachusetts hospitals during 1919 was exactly the same. In twenty-one hospitals in fourteen other states twenty-four cases (.13 per cent) in 18,336 admissions were reported as Huntington's chorea. There were only seventy-five cases (.1 per cent) in 70,987 admissions to forty-eight hospitals in sixteen different states. _Psychoses with Brain Tumor_ Brain tumors are more common perhaps than is generally understood. Cushing[193] shows that they were found in fifty-five, or 1.7 per cent, of 3,150 autopsies at the Johns Hopkins Hospital. He refers to Siedel, who observed them in 1.25 per cent of his cases in Munich and states that Blackburn found them in about two per cent of 1,642 autopsies at the St. Elizabeths Hospital in Washington. He also quotes Bruns as saying that two per cent of all neurological cases show intracranial growths. In the first twenty-five hundred surgical conditions admitted to the Peter Bent Brigham Hospital in Boston eight per cent were diagnosed as brain tumor. Cushing found that 66.6 per cent of 130 carefully studied growths were gliomata. Nearly four per cent were endotheliomas. In another series of seventy cases he found twenty-seven gliomas (38.5 per cent), seventeen adenomas (twenty-four per cent), seven endotheliomas (ten per cent), five interpeduncular and mixed growths (seven per cent), and other forms in smaller percentages. Many of the endotheliomas have undoubtedly been included in the past with the sarcomas. This may also be said of gliomas.